EP0890852B1 - A shielded welding device for optical fibers - Google Patents

A shielded welding device for optical fibers Download PDF

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Publication number
EP0890852B1
EP0890852B1 EP98850082A EP98850082A EP0890852B1 EP 0890852 B1 EP0890852 B1 EP 0890852B1 EP 98850082 A EP98850082 A EP 98850082A EP 98850082 A EP98850082 A EP 98850082A EP 0890852 B1 EP0890852 B1 EP 0890852B1
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EP
European Patent Office
Prior art keywords
casing
casing halves
fibers
halves
welding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98850082A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0890852A2 (en
EP0890852A3 (en
Inventor
Sasan Esmaeili
Hakan Ekwall
Dan Tillberg
Torsten Lund
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0890852A2 publication Critical patent/EP0890852A2/en
Publication of EP0890852A3 publication Critical patent/EP0890852A3/en
Application granted granted Critical
Publication of EP0890852B1 publication Critical patent/EP0890852B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch

Definitions

  • the present invention relates to a fiber welding device for welding optical fibers to each other, in particular for welding optical fibers composed to a fiber ribbon to each other, and subassemblies used in a fiber welding device.
  • optical fiber ribbons i.e. optical fibers, which by an exterior polymer sleeve are kept together to form a flat fiber package having a plurality of optical fibers extending in parallel, are more and more used.
  • a fiber ribbon can contain 4, 6, 8 or 12 individual fibers.
  • welding can be used.
  • devices are required which can be used in the field.
  • Such a welding device should among other things have a good shielding of the region around the splicing location, in which the very electrical arc is formed at the ends of the optical fibers, so that an operator of the welding device is well protected.
  • a shield-ing would also protect this area against contamination from the surroundings.
  • a number of different conditions must be fulfilled, such as that the individual optical fibers in the opposite ends of two fiber ribbons are well aligned with each other, that the alignment can be checked immediately before the welding operation and that the alignment then can possibly be corrected.
  • a background illumination of the fiber ends to be spliced to each other should be provided in order to obtain pictures for checking the positions of opposite fiber ends.
  • U.S. patent US-A 5,524,163 which corresponds to the published European patent application EP-A1 0 720 032, discloses a device and a method for splicing optical fibers.
  • the device comprises a microscope unit, a light emitting diode holder placed above the fibers and a cover enclosing the light emitting diode retainer.
  • the microscope unit consists of a housing, three microscopes, a shutter unit, two mirrors and a CCD-sensor.
  • the light emitting diode retainer which comprises three light emitting diodes, is mounted to swing about the same shaft as the cover and is locked in a swung-down position by means of a magnet.
  • a background illumination is obtained from the light emitting diodes directing light from above to the welding location. The light from the welding location is deflected by mirrors to reach a photodetector.
  • the published International patent application WO-A1 96/27811 discloses an illumination of the welding location comprising a light source located under the horizontal plane through the welding location, the light from the light source being deflected by two mirrors placed in a lid of the device.
  • An optical fiber welding device for welding fiber ribbons has a casing which is movable between a closed position and an open position. In the closed position the casing is located above and at the sides of the welding location and encloses at least in an upward direction, in a direction parallel to inserted fibers and in horizontal directions perpendicular to inserted fibers the welding location and also the components of the device which are located at the welding location such as electrodes and an electrode housing.
  • the casing is made of thin plate-shaped or sheet material and has a space-saving design and in particular the movement thereof is space-saving, since the casing performs a sliding moving so that in its movement the surfaces of the casing are all the time all located in substantially the same contiguous and continuous surface.
  • the surfaces of the casing then corresponds to a part of this continuous surface.
  • the continuous surface has a rotational symmetry about an axis.
  • This axis is also a rotational or swinging axis of the casing.
  • the axis is located above the welding location.
  • the inserted fibers are supported by some support and alignment means.
  • the highest points of the casing will in its movements always have substantially the same height over the welding location, the term height being here taken to mean the distance from the welding location to the highest points in a direction perpendicular to the fiber portions at the welding location and away from the body of the welding device and support and alignment means of the fibers.
  • the rotational axis of the casing is located at a position straight below the welding position, at some distance from that position and for instance in parallel to the inserted fiber ends.
  • the casing comprises two casing halves, which are mounted to swing around parallel shafts, the shafts being arranged at locations approximately vertically below the very welding location, at not too a small distance thereof.
  • the casing halves which are mechanically coupled to each other through a mechanical coupling comprising cooperating gear segments and thereby simultaneously and symmetrically move towards and away from each other, also in the case where only one half is operated, protect in their closed positions exterior dust particles from reaching the welding location and protect the operator from the electric welding arc and high electric and magnetic fields and loose particles.
  • the casings have a design which saves space and in their movement occupy a minimum of space, by the fact that they are designed as substantially sectors of the surface of a rotationally symmetric body such as a circular cylinder and by the fact that the rotational axes of the casings are placed at the points of the sectors, ordinarily very near each other.
  • a casing for a fiber welding device can comprise two casing halves, which are configured substantially identically to each other and which are mounted to be capable of swinging around suitably placed shafts, so that the halves can move in directions towards each other in order to engage with each other, so that the region around the electrodes is closed, and in directions away from each other in order to make the same region accessible.
  • the shapes of the casing and thus of the casing halves are such and in particular the shafts of the casing halves are located at such positions below the welding location, that the topmost point of the casing or casing halves at its/their movement between a closed position and an open position, i.e. for the casing halves in directions away from and towards each other, remains at a substantially constant height.
  • a swinging shaft of the casing or the shafts of the casing halves are advantageously located at positions which are placed substantially straight below the welding location, at a distance below it, which can for example correspond to substantially half the width of the inner portions of the device, the width being taken in the same direction as the movement directions of the casing or casing halves, i.e. perpendicularly to the longitudinal direction of inserted fibers.
  • An electrode housing is advantageously made as a single unit having means attached thereto for retaining electrodes and means for aligning and retaining fibers.
  • the electrodes and the welding location are located at the top surface of the electrode housing. Then also the swinging shafts of the casings halves are located below the electrode housing.
  • the casing halves can generally comprise flat side portions, which are perpendicular to the swinging shafts, and furthermore top portions, which connect the side portions at the exterior edges thereof and which comprise portions, which have the shape of a part of the envelope surface of a circular cylinder, where the axis of the cylinder coincides with the shaft of the respective casing half, i.e. a casing half can have the shape of substantially a sector of the exterior border surface of a circular-cylindrical body.
  • the top portions can also comprise substantially flat inner portions, which in their position, in which the casing halves are arranged at each other, are located at each other in the same horizontal plane and at their edges at a distance from the border surface between the casings connect to the portions having a part-cylindrical shape. Sealings can then be arranged at a distance from the border plane of the casing halves, in the closed positions thereof, so that they are always engaged with those portions of the top portions, which have the shape of the envelope of a part of a cylinder, i.e. so that the distance is longer than the length of a flat portion of the top portions.
  • the movements of the casing halves are furthermore advantageously mechanically coupled to each other using a suitable mechanical coupling, so that for manually operating a first casing half in order to move it in a direction towards or from a second casing half also the second half is moved in the corresponding way, in a direction towards or from the first casing half respectively.
  • the mechanical coupling can then comprise gear segments engaging each other, which are arranged at vertical side portions of the casing halves, the axes of the segments coinciding with the swinging shafts of the casing halves.
  • the device can comprise fiber alignment and retaining means.
  • a view is shown, partly as a sectional view, of a fiber welding device in particular intended for welding optical fiber ribbons.
  • the view/section is taken substantially centrally through the device and the view is seen in parallel to and the sectional surfaces perpendicularly to the direction of the fibers which are to be welded to each other.
  • Fig. 2 a view is shown, which also partly is a cross-sectional view, of the welding device, in which the view is taken in a direction perpendicular to the fibers as indicated at 1 and the sectional surfaces are parallel to the fibers, so that this picture is perpendicular to the picture of Fig. 1.
  • the components of the device are carried by an elongated frame bar 3 having a rectangular cross section, which is supported on a base 5 by means of four oblique legs 7.
  • the legs 7 can comprise elastic, cushioning intermediate pieces, such as 9.
  • Centrally on the frame bar 3 is a centre frame 11 attached and stands up therefrom.
  • the centre frame 11 has generally an isosceles triangular shape, as seen in a longitudinal direction parallel to the frame bar 3 and to inserted fibers, the triangle having its point between the two equal legs directed downwards towards the frame bar 3 and having an upper, substantially horizontal and flat surface and having two symmetrically located projections or triangular halves 15.
  • the projections 15 carry light sources and cameras, see hereinafter.
  • the horizontal top surface of the centre frame 11 carries an electrode housing 17, to which parts are attached, which are required for retaining the ends of the fibers and for the alignment thereof with each other, and further welding electrodes, as will be described hereinafter.
  • an electrode housing 17 At the exterior sides of the projections 15 oblique cylindrical through-holes 19 are provided, which extend in parallel to the exterior cut-off sides of the projections and the axes of which are located in a vertical centre plane.
  • This centre plane is simultaneously a symmetry plane of most of the components of the device and in this plane also the end surfaces of the fibers to be spliced to each other are located.
  • the axes of the holes 19 and the exterior cut-off surfaces of the projections 15 are located in an angle of between 30 and 45° in relation to a vertical plane, in the preferred case in an angle between 35 and 40° and preferably about 37°.
  • light passes from light sources arranged in the bottom end of the holes, such as from light emitting diodes 21.
  • diaphragm plates 23 which are constituted by plates, which perpendicularly project into the interior of the holes 19 and are arranged in slots in the centre frame 11 at a distance from the top openings thereof, this distance being approximately equal to the diameter of the holes 19.
  • the aperture plates 23 have a straight inner or lower edge and project into approximately the centre of the holes 19, so that the light is allow to pass through a window, having an approximately semi-circular shape.
  • light diffusing means are arranged, such as suitable optical gratings 25, in order to produce a uniform illumination.
  • Camera units 27, see also Fig. 3, are inserted with their front parts in corresponding holes in the oblique surfaces of the inverted triangular shape of the centre frame 11.
  • the camera units 27 have a front part 29, which contains their optical systems.
  • the optical axes of the optical systems are parallel to the axes of the holes 19 and cross the longitudinal axis of the fiber ribbons to be spliced, exactly in the splicing plane and are preferably also located in this plane.
  • the prolongations of the holes for the camera units 27 continue up to the bottom sides of the electrode housing 17 in order for light from the splicing region of the fibers to be imaged by the optical systems on light sensitive elements of the camera units 27, the light sensitive elements being located at a plane 31 and arranged in an oblique angle and thus not perpendicularly to the axes of the optical system, this angle being adapted to produce a sharp picture of all individual fibers in fiber ribbons to be spliced.
  • the upper part of the centre frame 11 and the electrode housing 17 are protected by two identical casing halves 33, which are capable of swinging towards and away from each other.
  • casing halves 33 On the interior side of the casings, at the topmost portions thereof having approximately horizontal surfaces, mirrors 35 are arranged having horizontal reflecting surfaces. The mirrors 35 are placed, so that light rays from the light diffusing means or diffusor elements 25 can be mirrored therein and reflected by their reflecting surfaces, so that the reflected light rays can enter the optical systems of the camera units 27 and be conducted therein towards the light sensitive surfaces in the camera units.
  • the fiber ribbons 1 to be spliced are retained, see Fig. 2, by fixtures or retainers 39, which are retained by locking elements 41 at the somewhat sloping top surfaces of parallelogram blocks 43, see Swedish patent application 9300578-3, filed March 22, 1993.
  • the parallelogram blocks 43 are thus arranged having their longitudinal direction perpendicular to the triangular shape of the centre frame 11. They have rectangular recesses 45 comprising thin, uniformly thick, remaining vertical portions 47. Their bottom portions are attached to the top side of the frame bar 3 and their top portions comprise the sloping planes, at which the fixtures 39 are located.
  • the top portions of the parallelogram blocks 43 can be moved from their rest positions having the vertical portions 47 in a straight configuration to positions closer to the transversal symmetry plane of the device by operating control motors 48 acting on levers 50 arranged in posts 49, which are attached to the frame bar 3 outside the parallelogram blocks 43. Then the straight vertical portions 47 are somewhat bent.
  • the casing halves 33 which have identical shapes and are rotatable around shafts 51, which are located in the longitudinal direction of the device, i.e. generally also in the longitudinal direction of the fibers 1, see also Fig. 4.
  • Recesses 52 intended for thumbs of an operator in order to make the opening and closing movement are arranged on the outside of the casings 33, close to the border surface, the recesses being visible in Fig. 1.
  • the movements of the casing halves are coupled to each other by gear segments 53 engaging each other, so that the casings move in a coupled way towards or away from each other in order to seal, in their position engaging each other at the border surface, the space around the electrode housing 17 at least in directions upwards.
  • a magnet 54 see Fig. 2, arranged on one of the casings for cooperation with a corresponding armature on the other casing.
  • the casings 33 provide a shielding from exterior particles and protect the operator from the electric arc used in the welding operation. They have a design which saves space and their shafts are so arranged, that the casings in the movement are always located close to the interior parts of the welding device.
  • the casings 33 have upper portions and side portions, the latter generally having the shape of circular sectors.
  • the shafts 51 are arranged in regions at the sector points and at the interior sector edge and adjacent to the sector points also the gear segments 53 are located.
  • microswitches are provided, not shown, which are arranged to cut-off the current from a possible electrical high voltage, which is supplied to the electrodes, in order to protect the operator.
  • the exterior parts of the top portions of the casings 33 have generally the shape of parts of an envelope surface of a circular cylinder, the axis of the cylinder coinciding with the respective shaft 51.
  • the inner parts of the upper portions at the border surface between the casing halves are essentially flat and are located in the same horizontal plane, when the casings are brought to each other.
  • the mirrors 35 are arranged at the connection to the outer-most, part-cylindrical parts.
  • Sealings 55 see Fig. 1, are arranged in protruding edges 56 of an exterior protecting housing, not shown, and are engaged with the part-cylindrical parts of the casings 33 and the side surfaces. They are arranged, so that they seal against the casings, in any positions thereof.
  • the electrode housing 17, see Fig. 5, comprises a substantially rectangular block of high voltage resistant polymer material. Electrodes 57, between the points of which an electrical arc is formed in a splicing operation, are located in grooves having quadratic cross sections. The grooves are made in the top surface of the housing 17 and extend centrally in the longitudinal direction of the housing, perpendicularly to the fibers to be welded to each other. At the rear portions of the grooves transverse recesses 59 are provided, see also the view from above in Fig. 9, in which spring plates 61 are arranged. The spring plates, see Figs. 6 and 7, have a U-shape, comprising a cut-out 63 in the leg of the U-shape, which faces the points of the electrodes.
  • the rear s portion of the electrodes 57 pass in order to be pressed by the marginal portions of the plates adjacent to the cut-outs in a direction towards their front ends or towards their points by cooperation with abutment rings 63 rigidly attached at a small distance from the rear ends of the electrodes, see also Fig. 8.
  • abutment rings 63 rigidly attached at a small distance from the rear ends of the electrodes, see also Fig. 8.
  • These abutment rings also form stops for the movement of the electrodes 57 in this direction and thereby defines by engaging with the corresponding front side surfaces in the recesses 59, the position of the electrodes in their longitudinal directions.
  • Electric high voltage is conducted to the electrode 57 from electrically, conducting, elongated contact bodies 64 having a rectangular cross section, which are placed tightly in recesses in the electrode housing 17 below the grooves, in which the electrodes are located, see also the sectional view in Fig. 10, so that the contact bodies have contact with the bottom surface of the electrodes 57 along a generatrix thereof over a major portion of the length of the electrodes.
  • the contact bodies 64 have a portion 68, projecting to the side and horizontally and having the shape of a rectangular block, at approximately their centre portions, which projecting portion is arranged tightly in a corresponding recess in the electrode housing 17 and has its top surface located in the same plane as the top surface of the electrode housing and its bottom surface in the same plane as the bottom surface of the oblong portions of the contact bodies.
  • Screws 65 of a suitable metal pass in threaded bores down from the top side of the projecting portion 68 of the contact bodies 64.
  • the screws 65 press with their lower ends against end portions, from which the electric isolation has been removed, of electrical high voltage cables 66, which thereby are pressed against the bottom surface in holes in the bottom portions of the contact bodies 54, through which the ends carrying no electric isolation enter.
  • Corresponding holes are made from one side of the electrode housing 17, so that the cable ends can be entered therethrough into the holes of the contact bodies 64.
  • retainer blocks 67, 67' are attached by means of screws, see Fig. 12, which secure the electrodes finally in the position in which their abutment rings 63 engage in the recesses 59.
  • One retainer block 67' is higher than the other block 67 and carries at its top elevated portion a light source, not shown, which directs a light beam to the very welding location. This arrangement facilitates when inserting fibers and adjusting them in the respective V-grooves in the case where the surrounding illumination is bad.
  • a ceramic V-groove plate 69 Centrally in the electrode housing 17, in a transverse recess in the top surface thereof, a ceramic V-groove plate 69 is provided, which has a central recess, which interrupts the V-grooves 70, see Fig. 9, and has a location corresponding to the region between the points of the electrodes 57, in which the electric arc is formed, when welding fibers to each other.
  • the fibers are retained at their positions in the V-grooves 70 by means of a hold-down arm 71, which is mounted to be movable in the electrode house 17 about a shaft 73 parallel to the longitudinal direction of the device and the fiber direction.
  • the hold-down arm 71 has at its front end two individually movable hold-down units 75, see also Figs.
  • the hold-down arm 71 is automatically folded down, when the casings 33 are brought to their closed positions. This is produced by means of a freely rotatable wheel 81, see Figs. 13, 2 and 1, which rotates about a shaft 83 attached to the side wall of the corresponding casing half 33.
  • the wheel 81 has a groove at its periphery, in which a rubber ring 85 is mounted, and this ring comes in contact with the top side of the hold-down arm 71 and can bring it downwards, when the casing half is rotated inwards.
  • the hold-down units 75 are, as has been mentioned above, elastically arranged. They have a U-shape, as seen perpendicular to inserted fibers, see Fig. 13, and the legs of the U-shape are located in recesses, see Fig. 9, on the sides of the front end of the hold-down arm 71 having a fork-shape, see also Fig. 13, in which each fork arm with its front end is bent downwards.
  • Two helical compression springs 86 are located in holes extending upwards in the fork arms, see Fig.
  • a pin 87 is attached in holes in the legs of the U-shape and pass through an oblong hole 88 in the hold-down arm, so that it and thereby the hold-down elements 75 can move vertically, as seen in the folded-down position of the hold-down arm 71.
  • the pin 87 projects through some distance towards the free side of the hold-down arm 71.
  • levers 91 are movably mounted at shafts 93, which are attached to the side portions of the protecting casing halves 33.
  • Such a lever 91 has then the recess 89 at one of its ends, whereas the other rear end, which is located on the opposite side of the lever shaft 93, is influenced as its bottom side by a helical compression spring 96 acting between this end and a support block 95, so that the front end of the lever 91 is located in the lowest position possible.
  • the support block 95 is attached to a vertical side portion of the protecting casing 33.
  • a push rod 97 With the top side of the rear end of the lever 91 is the lower end of a push rod 97 engaged, which is movably mounted in the casing half 33, which is located above the lever.
  • the upper end of the push rod 97 is enlarged in order to form an operating knob 99, which is located in a recess from the exterior side of the casing 33, so the knob 99 is accessible from the outside of the casing, see also Fig. 1.
  • the rear end of the lever 91 moves downwards and its front ends upwards.
  • the recess 89 at the front end then engages the projecting end of the pin 87 and thereby lifts the down hold unit 75.
  • possible inserted optical fibers are released and it is possible to adjust their positions.
  • the knob 99 is released, whereby the fibers are again retained.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
EP98850082A 1997-05-23 1998-05-19 A shielded welding device for optical fibers Expired - Lifetime EP0890852B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9701954 1997-05-23
SE9701954A SE511820C2 (sv) 1997-05-23 1997-05-23 Anordning för hopsvetsning av optiska fibrer

Publications (3)

Publication Number Publication Date
EP0890852A2 EP0890852A2 (en) 1999-01-13
EP0890852A3 EP0890852A3 (en) 1999-06-02
EP0890852B1 true EP0890852B1 (en) 2006-03-01

Family

ID=20407077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98850082A Expired - Lifetime EP0890852B1 (en) 1997-05-23 1998-05-19 A shielded welding device for optical fibers

Country Status (5)

Country Link
US (1) US5961865A (ja)
EP (1) EP0890852B1 (ja)
JP (1) JPH1190625A (ja)
DE (1) DE69833640T2 (ja)
SE (1) SE511820C2 (ja)

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SE9901493D0 (sv) * 1999-04-26 1999-04-26 Ericsson Telefon Ab L M Fibersvetsningsapparat med uppvärmningsanordning
JP3345856B2 (ja) * 1999-09-09 2002-11-18 古河電気工業株式会社 光ファイバ融着接続機のスクリーニング機構
SE523329C2 (sv) * 2000-06-20 2004-04-13 Ericsson Telefon Ab L M Bestämning av optisk fibertyp
US6844520B2 (en) * 2002-09-26 2005-01-18 General Electric Company Methods for fabricating gas turbine engine combustors
US6764230B1 (en) * 2003-03-21 2004-07-20 Future Instruments Fiber Optics Ab Optical fiber splicing device
US7488125B2 (en) * 2004-01-23 2009-02-10 Fujikura Ltd. Optical fiber fusion splicer and covering device for high voltage part thereof
DE102007019796A1 (de) * 2007-04-26 2008-10-30 CCS Technology, Inc., Wilmington Spleißgerät für Lichtleitfasern und Verfahren zum Betreiben eines Spleißgerätes für Lichtleitfasern
RU2407618C2 (ru) * 2008-11-06 2010-12-27 Федеральное государственное унитарное предприятие "Государственный космический научно-производственный центр им. М.В. Хруничева" Устройство для сборки под сварку кольцевых стыков емкостей
CH700691B1 (de) * 2009-03-20 2020-09-15 Diamond Sa Vorrichtung und Verfahren zum Spleissen von Lichtwellenleitern, sowie Verwendung eines Endstückes in einer Vorrichtung zum Spleissen.
JP5290929B2 (ja) * 2009-10-20 2013-09-18 古河電気工業株式会社 融着接続機
WO2013146138A1 (ja) 2012-03-29 2013-10-03 株式会社フジクラ 光ファイバ融着接続機
JP5209126B1 (ja) 2012-03-29 2013-06-12 株式会社フジクラ 光ファイバ融着接続機
CN107807421B (zh) * 2017-12-15 2019-10-11 中国电子科技集团公司第四十一研究所 一种光纤熔接放电电极高度自动调整装置及方法

Citations (1)

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EP0720032A1 (en) * 1994-12-29 1996-07-03 Sumitomo Electric Industries, Ltd. Apparatus for splicing optical fibers and method

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GB2117916B (en) * 1982-02-17 1986-08-28 Standard Telephones Cables Ltd Optic fibre fusion splicing
JPS5938718A (ja) * 1982-08-30 1984-03-02 Furukawa Electric Co Ltd:The 光フアイバ融着接続用保持装置
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AU4937696A (en) * 1995-03-07 1996-09-23 Siemens Aktiengesellschaft Splicing device for welding optical fibres

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0720032A1 (en) * 1994-12-29 1996-07-03 Sumitomo Electric Industries, Ltd. Apparatus for splicing optical fibers and method

Also Published As

Publication number Publication date
EP0890852A2 (en) 1999-01-13
SE511820C2 (sv) 1999-11-29
EP0890852A3 (en) 1999-06-02
DE69833640D1 (de) 2006-04-27
JPH1190625A (ja) 1999-04-06
SE9701954D0 (sv) 1997-05-23
SE9701954L (sv) 1998-11-24
US5961865A (en) 1999-10-05
DE69833640T2 (de) 2007-02-01

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